diff --git a/.github/workflows/helm_ci.yml b/.github/workflows/helm_ci.yml
index cd18fc22c4..d62153e608 100644
--- a/.github/workflows/helm_ci.yml
+++ b/.github/workflows/helm_ci.yml
@@ -599,6 +599,22 @@ jobs:
             --set master.data.storageClass=standard > /tmp/pvc.yaml
           grep -q "PersistentVolumeClaim" /tmp/pvc.yaml
           echo "PVC configuration renders correctly"
+
+          echo "=== Testing existingClaim volumes are mounted ==="
+          # The filer's data and logs and the master's logs declared an existingClaim
+          # volume but mounted only hostPath, persistentVolumeClaim and emptyDir, so
+          # the filer kept its metadata store on the container's own filesystem.
+          helm template test $CHART_DIR --show-only templates/filer/filer-statefulset.yaml \
+            --set filer.data.type=existingClaim --set filer.data.claimName=filer-data \
+            --set filer.logs.type=existingClaim --set filer.logs.claimName=filer-logs > /tmp/filer-existing-claim.yaml
+          grep -A 1 -- '- name: data-filer$' /tmp/filer-existing-claim.yaml | grep -q 'mountPath: /data$'
+          grep -A 1 -- '- name: seaweedfs-filer-log-volume$' /tmp/filer-existing-claim.yaml | grep -q 'mountPath: "/logs/"$'
+          grep -q -- '-logdir=/logs' /tmp/filer-existing-claim.yaml
+          helm template test $CHART_DIR --show-only templates/master/master-statefulset.yaml \
+            --set master.logs.type=existingClaim --set master.logs.claimName=master-logs > /tmp/master-existing-claim.yaml
+          grep -A 1 -- '- name: seaweedfs-master-log-volume$' /tmp/master-existing-claim.yaml | grep -q 'mountPath: "/logs/"$'
+          grep -q -- '-logdir=/logs' /tmp/master-existing-claim.yaml
+          echo "existingClaim volumes are mounted"
           
           echo "=== Testing with custom replicas ==="
           helm template test $CHART_DIR \
diff --git a/k8s/charts/seaweedfs/templates/filer/filer-statefulset.yaml b/k8s/charts/seaweedfs/templates/filer/filer-statefulset.yaml
index 97276773b5..6db270a365 100644
--- a/k8s/charts/seaweedfs/templates/filer/filer-statefulset.yaml
+++ b/k8s/charts/seaweedfs/templates/filer/filer-statefulset.yaml
@@ -209,7 +209,7 @@ spec:
             - "-ec"
             - |
               exec /usr/bin/weed \
-              {{- if or (eq .Values.filer.logs.type "hostPath") (eq .Values.filer.logs.type "persistentVolumeClaim") (eq .Values.filer.logs.type "emptyDir") }}
+              {{- if or (eq .Values.filer.logs.type "hostPath") (eq .Values.filer.logs.type "persistentVolumeClaim") (eq .Values.filer.logs.type "emptyDir") (eq .Values.filer.logs.type "existingClaim") }}
               -logdir=/logs \
               {{- else }}
               -logtostderr=true \
@@ -284,7 +284,7 @@ spec:
               {{- end }}
           volumeMounts:
             {{- include "seaweedfs.tmpDirVolumeMount" (list . .Values.filer.containerSecurityContext (tpl (.Values.filer.extraVolumeMounts | default "") .) (tpl (.Values.filer.extraVolumes | default "") .)) | nindent 12 }}
-            {{- if (or (eq .Values.filer.logs.type "hostPath") (eq .Values.filer.logs.type "persistentVolumeClaim") (eq .Values.filer.logs.type "emptyDir")) }}
+            {{- if (or (eq .Values.filer.logs.type "hostPath") (eq .Values.filer.logs.type "persistentVolumeClaim") (eq .Values.filer.logs.type "emptyDir") (eq .Values.filer.logs.type "existingClaim")) }}
             - name: seaweedfs-filer-log-volume
               mountPath: "/logs/"
             {{- end }}
@@ -293,7 +293,7 @@ spec:
               mountPath: /etc/sw
               readOnly: true
             {{- end }}
-            {{- if (or .Values.filer.enablePVC (or (eq .Values.filer.data.type "hostPath") (eq .Values.filer.data.type "persistentVolumeClaim") (eq .Values.filer.data.type "emptyDir"))) }}
+            {{- if (or .Values.filer.enablePVC (or (eq .Values.filer.data.type "hostPath") (eq .Values.filer.data.type "persistentVolumeClaim") (eq .Values.filer.data.type "emptyDir") (eq .Values.filer.data.type "existingClaim"))) }}
             - name: data-filer
               mountPath: /data
             {{- end }}
diff --git a/k8s/charts/seaweedfs/templates/master/master-statefulset.yaml b/k8s/charts/seaweedfs/templates/master/master-statefulset.yaml
index 0b4fc38058..87f015637e 100644
--- a/k8s/charts/seaweedfs/templates/master/master-statefulset.yaml
+++ b/k8s/charts/seaweedfs/templates/master/master-statefulset.yaml
@@ -117,7 +117,7 @@ spec:
             - "-ec"
             - |
               exec /usr/bin/weed \
-              {{- if or (eq .Values.master.logs.type "hostPath") (eq .Values.master.logs.type "persistentVolumeClaim") (eq .Values.master.logs.type "emptyDir") }}
+              {{- if or (eq .Values.master.logs.type "hostPath") (eq .Values.master.logs.type "persistentVolumeClaim") (eq .Values.master.logs.type "emptyDir") (eq .Values.master.logs.type "existingClaim") }}
               -logdir=/logs \
               {{- else }}
               -logtostderr=true \
@@ -184,7 +184,7 @@ spec:
             {{- include "seaweedfs.tmpDirVolumeMount" (list . .Values.master.containerSecurityContext (tpl (.Values.master.extraVolumeMounts | default "") .) (tpl (.Values.master.extraVolumes | default "") .)) | nindent 12 }}
             - name : data-{{ .Release.Namespace }}
               mountPath: /data
-            {{- if or (eq .Values.master.logs.type "hostPath") (eq .Values.master.logs.type "persistentVolumeClaim") (eq .Values.master.logs.type "emptyDir") }}
+            {{- if or (eq .Values.master.logs.type "hostPath") (eq .Values.master.logs.type "persistentVolumeClaim") (eq .Values.master.logs.type "emptyDir") (eq .Values.master.logs.type "existingClaim") }}
             - name: seaweedfs-master-log-volume
               mountPath: "/logs/"
             {{- end }}